Water cooled doorframe



April 2, 1940- H. R. LoxTERMAN WATER COOLED DOORFBAME Filed March 30, 1939 0 Rol... 97 mf 1 1 mn. mi s U R W 25 W n. e H6 Patented Apr. 2, 1940 l UNITED STATES PATENT OFI-ICE v Y' 2,195,538 'f WATER cooLED'DooannAME signor toBlaw-Knox a corporation of New Application Maren so',

, 9 Claims.

Patent No. 2,084,017. Inthe structures shown'iny said patents a tubular member is provided for surrounding the furnace door and-fthe water is circulated therethrough. The tubular header is.

in communication with the main circulation chamber of the frame and this main circulation chamber is formed of a pluralityof plates which are welded together and welded to the header surrounding the furnace opening. As shown in said patents the main circulation chamber is not independently water ytight Vbut the header4 surroundingthe furnace opening forms a Wall thereof. A number of diiculties have been encountered with structures of this character and it is the purpose of the present invention to overcome them. f l' The body section of the frame of structures of the above character is protectedfrom'the more intense heat of the furnace by the refractories and bythe door. The tube sectionvwhich sur-7 rounds the furnace opening is exposed yto thel intense heat of the furnace. The hot water, which always contains impurities, causes corrosion of the walls. Furthermore this tube section isv deformed or ruptured frequently due to the impact of the solid' material being charged into the lfurnace.' Of course care is ordinarily ltaliehin'the operation of melting furnaces to prevent undue abuse of the frame structure during the charging operations but impacts do occur from time to time regardless of the precautions taken. The

intense heat to which this portion of the frame.

is subjected also tends `to cause distortion between it and the main body of theframe and this tends to cause leaking in the weld between the tube and the main body of the frame-`v vIt will be obvious that any'break in the weld between the plates forming the body lsection of the frame and the tube will permit leakage and sucn leakage will be detrimental to the hot brickwork of the furnace and will also increase the hazard of liquid steel or slag explosions. l

By the present invention I provide a structure which obviatesthe Various diiculties mentioned above. In accordance with my invention I provide a frame comprising two independently water-tight coolingsections for the sides .andtop Company, Pittsburgh, Pa., Jersey l 1939, serial No. 264,92

of the door opening, one of the cooling sections being arranged to immediately surround the door opening so as to receive 'direct heat from the furnace and the other cooling section being astride the section surrounding the door open- "5` ing. The section surrounding the door opening is connected to the other section byl appropriate connections so that vwater can be circulated v through both of them.- The section surroundingy the door opening is in the form of a tube and is 10 preferablysecured `to the main body 'section of the frame 'by weld's. The welding between the two need not be water-:tight because the two sec ytions are independently water-'tight and any breakdown -of the welds inthe event that they are originally made continuous will not affect the oper-ation. of the frame. l l

-By the use of a structure such as I provide, at the yexpiration of the usual -life of the tube portion the tube may be cut away from the balance of the frame and replaced with a new tube.'y 'Ihis matev rially increases the life of the total* frame and cuts down operating costs. Ihe body of the frame is not injured in any way-by the cuting loose of the worn tube ofthe frame and, furthermore, the soundness and water-tightness of the new tube installed and the body portion is not actually v affected by the welding or other means employed for fastening the tube in proper positon. If welding is used, only sufficient weldingneed be Idone to connectv the two parts -with suicient structural strength. The welding does'not need to be continuous or of a water-tight character.'

In the accompanying drawing I have shown for purposes of illustration only a preferred embodiment and several modications of my invention. In the drawings Figure 1 is la front elevation of the frame which Iprovide; w

Figure-2 is a section taken along the line II-II and showing the frame and the cooperating door in position infront of the furnace opening; y,

Figure 3 is a section taken along the line III- III of Figure l; f

Figure 4 is a section taken along the line IVe-IV ofFigu-re1;.

Figure 5 is a partial sectional view showing ai modified arrangement of the lwater connections between the legs of the body portion and the legs f of the tube; y v

' Figure 6 is a partial elevation showing a `still further typel of connection between the legs. of the main frame and the tube; l y

Figure 7 is a partial sectional View. similar to .Figure 4 Ashowing amodified form of conriejctionjjl between the tube and the water discharge pipe; and

Figure 8 is a sectional View similar to Figure 3` showing a modified form of main frame and the connection thereof with the tube.

As shown in the drawing, the doorrame which I provide embodies two independently water-tight cooling sections for the sides and top of the door opening. One of the sections, the tube2, is arn ranged to immediately surround the door opening 3. The body section 4 of the frame is. positioned astride the tube 2. The tube 2 is substantially U-shaped, the legs extending downwardly along the sides of the furnace opening. This tube is shown in the drawing as being in the yform of a cylindrical pipe. It will be understood, however, that my invention is not limited to the use of a cylindrical tube and` that thev tube may assume any suitable configuration.

The body section 4 of the frame is formed of a plurality of plates which are welded or otherwise suitably secured together so as to provide an independent water-tight circulation chamber. The upper portion of the body section extends over the top of the tube 2 and leg portions Ei extend downwardly along or adjacent to the legs 5 of the tube.

Appropriate connections between the tube 2 and the body section 4 are provided for circulating the cooling fluid therethrough. These connections may, of course, be arranged to circulate the water through the portions of the frame in any manner desired, the manner shown and described herein being one suitable arrangement, but my invention is .not limited to this or any other particular circulation of cooling water through the portions of the frame. v'I'he body section 4 has an inlet 'I and by means of this inlet and the conduit 8 connected therewith water is discharged into the body section adjacent the upper. end thereof. The water flows in both directions'through the upper portion of the body section and then passes downwardly through the legs 6 thereof. A conduit Sconnects the bottom of each leg 6 with the adjacent leg 5 of the tube 2 so that water will be discharged from the legs 6` of the bodysection into the legs 5 of the tube. The water will then circulate upwardly through. the tube 2 and passes therefrom through ka connecting pipe Il] into a conduit Il which is connected to the outlet I2 in the top wall of the body section. A vent hole I3 `is located in the Aconduit II to permit any air which may have collected in the body section to escape through the outlet opening I2.

As shown in Figures 1 and 4 the connecting pipe I0 may be joined to the conduit I I by welding. Any other suitable form of connection may be utilized so long as the connecting pipe ID may be readily disengaged from the conduit I I in order to permit the removal of the tube 2 from the body section of the frame when it is necessary or desirable to replace it.

In Figure '7 I have illustrated a modified form of connection between thek connecting pipe Il) andthe conduit I I. As illustrated 'therein the connecting pipe I 0 and the conduit II may be exteriorly threaded for cooperation with a standard connector I4..

The connections between the legs 6 ofthe main section of the frame and the legs 5 of the tube. may` assume various different forms. `In Figure 5 I have illustrated a connection embodyingy a U-shaped conduit I5, the ends of which'are inserted in the adjacent legs 5 and Iil through appropriate openings therein. Where a conduit of this character is utilized it may be welded to the side walls of the openings through which it extends.

In Figure 6 I have shown a further type of connection between the adjacent legs 5 and 6 of the cooling members. In this embodiment a standard elbow coupling and union I6 is employed.

The body section 4 of the frame sits astride the tube section 2 and is secured thereto by weld- Aing or any other desirable method of holding them together. As shown in Figures 1, 2 and 3,

' the tube section 2 is welded to the adjacent wall I'I of the leg 6. The front plate I8 of the body section extends beyond the side plate I1 and it alsois weldedftov the tube section 2. The front plate I8 is joined to the tube section at the edge thereof which projects beyond the wall or plate I1.

The welds connecting the tube 2 and the body sectionmay extend substantially continuously aroundthe tubeV or the two cooling sections can be secured together only at spaced points.

In Figure I have shown a slightly different method of securing the cooling members together. In this embodiment the frontplate I8 and the rear plate I9 of the body section are extended beyond the `side plate or wall I'I and the extensions thereof are welded to the tube` 2. It will beobvious that in either of these embodiments `the tube 2 may be spaced a suitable distance from the body section. yIt, will lalso be obvious that in `either of the embodiments the welds can be severed readily and the tube section separated from the body section and a new tube connected thereto. y

As shown in Figure 2, the cooling member or tube 2 is located adjacent the furnace opening 3 inthe furnace wall 20. This member will be subjected tothe intense heat of the furnace as it is positioned between the furnace door 2l and the furnace wall 20 adjacent the opening. The legs 6 vof the body section and the upper portion of the body section will be protected toa substantial extent from the high furnace temperatures. The welds between the body section and the tube will likewise befprotected to some extent from the high furnace temperatures although .in View of the independent water-tightness of the cooling members it is immaterial whether the welds hold up completely. As stated above, in the prior art structures, it is absolutely essential that they withstand the temperature effects or leakage will result.

i While it is not essential that the body section be cut away adjacent the connection between the connecting pipey I0 and the conduit II as shown in Figure 1, I preferably cut the body portion away to permit ready access to the connection in order'to facilitate the replacement of the tube section after it has outlived its usefulness.

It`will be apparent from the above description that the structureswhich I provide possess the advantages referred to above, namely, replaceability of the tube section, independent watertightness of the cooling sections, the 'elimination of sharp corners and hence vthe elimination of cracking'V and :opening up'of the welds, and increased life of the total frame. v

While I have shown and described preferred embodiments of my invention it will be understood that -I do not intend to be limited thereby and that my invention may be otherwise embodied within the scope ofthe appended claims. I claim:y 1'. A ho'llow Water-cooled'furnace doorframe comprising two independently water-tight cooling sections for the sides and top of the door opening, one of said sections being tubular and arranged to immediately surround the door opening so as to receive direct heat from the furnace and the other of said sections being positioned astride the tubular section, connections joining the two sections into a single unit, and pipe connections for circulating water through said sections from a single source of supply.

2. A hollow water-cooled furnace doorframe comprising a water-tight tubular section forming the arch of the doorframe, a water-tight body section having walls independent of the tube section, means for circulating water through both the tube section and the body section, and connections for joining the tube and body sections, such connections permitting the joining 0f the two sections without effecting the watertightness of either and permitting the separation thereof without modifying the water-tightness of the body section. Y

3. A hollow water-cooled furnace doorframe comprising a tubular section of inverted U-shape forming the arch of the doorframe, a body section having walls forming a water-tight circulation chamber independently of the tubular section, said body section having a top portion extending over the top of the tubular section'and legs extending downwardly therefrom along the legs of the tubular section, means lproviding a fluid connection between each leg of the body section and the adjacent leg of the tubular section adjacent the bottom thereof, and connections for circulating a cooling fluid through both the tubular and body sections.

4. A hollow water-cooled furnace doorframe comprising a tubular section forming the arch of the doorframe, a body section having walls forming a complete water-tight circulation chamber independently of the tubular section, said body section having a top portion extending over the top of the tubular section and legs extending downwardly therefrom adjacent the tubular section, means for detachably securing together the tubular and body sections, and fluid connections including connections between the legs of the body section and the tubular section for circur lating a cooling fluid through the tubular section and the body section.

5. A hollow water-cooled furnace doorframe comprising a tubular section of inverted U-shape forming the arch of the doorframe, a body section having walls forming a complete water-tight circulation chamber independently of the tubular section, said body section having a top portion extending over the top of the tubular section and legs extending downwardly therefrom along the legs of said tubular section, a well of the body section conforming in general configuration with the tubular section and said wall and tubular..

section being welded together at spaced points along the periphery of the tubular section, means providing a fluid connection between each leg of the body section and the adjacent leg of the tubular section, and connections for circulatingA a cooling uid through the tubular section and the circulation chamber.

.the tubular section and legs extending down Wardly therefrom along the legs of the tubularV section, `means providing a fluid connection between each leg of the body section and the adjacent leg of the tubular section nearthe bottom thereof, and connections including a conduit coml municating with the tubular section' adjacent the top thereof and extending through the top portion of the body section for circulating a cooling fluid through both of said sections.

'5. A hollow water-'cooled furnace doorframe comprisingy a tubular section forming the arch of the doorframe, a body section having walls forming a water-tigl'it circulation chamber independently of the tubular section, said body section having a top portion and legs extending downwardly therefrom along the legs of the tubular section,` a yU-shaped conduit providing a fluid vconnection betwen each leg of the body section and the adjacent. leg of the tubular section, the legs of such U-Shaped conduit extending section having walls independent of the tubular section, said body vsection having a top portion extending over the top of the tubular section and legs extending downwardly therefrom along the legs of the tubular section and having at least one wall extending beyond the main portion of the body section connected to the tubular section, means providing a fluid-tight connection between each leg of the body section and the adjacent leg of the tubular section adjacent the bottom thereof, and connections for circulating a cooling fluid through both the tubular and body sections. y

9. A hollow water-cooled furnace doorframe comprising a tubular section forming the arch of the doorframe, a body section having walls forming a ywater-tight circulation chamber independently of the tubular section, said body section having a top portion extending over the top of the tubular section and legs extending downwardly therefrom along the legs of the tubular section and having at least one Wall extending beyond the other walls ofthe body section and connected to said tubular section, meansy providing a fluid connection between each leg of the body section and the adjacent leg lof the tubular section near the bottom thereof, and connections including a conduit communicating with the tubular section adjacent the top thereof and eX- tending through the top portion of the body section for circulating a cooling fluid through both of said sections.

HENRY RUSSELL LOXTERMAN. 

